So Fine! #50 is a 50 wt. 3-ply filament polyester thread for smooth, consistent stitching in quilting, general all-purpose sewing, and garment construction. Its ultra-low lint keeps machines clean, while minimal tension adjustments make it a true “set it and forget it” thread. Fine yet strong, it produces flat seams that hold up to hot pressing and blends seamlessly into fabric. Trusted by sewists for clean performance, strength, and reliable results, it’s the perfect upgrade thread. 3,280 yards, 50 wt. (30 tex), 3-ply filament polyester, matte finish.